Sypho Turner is only 56 years old, but when he sits on the trash-strewn pavement below the Southwest Freeway overpass near the Wheeler Metro Station in Midtown, the low light deepens his cracked skin, turns his toothless smile into a black pit and makes his battered face look like a well-worn catcher’s mitt. He’d pass for at least a few decades older, perhaps even for a corpse. Years of smoking crack cocaine will do that to a man. But the fresh bruises and scabs on his arms and head — “battle scars,” as Sypho excitedly describes them — aren’t from crack. In fact, Sypho says, he hasn’t smoked crack or even weed in a few years. His scars are instead from kush, the new drug of choice among Houston’s homeless.